Cooling device for denitrification of leachate

Abstract

The utility model discloses a cooling device for percolate denitrification, which comprises a nitrification tank, a denitrification tank, a defoaming piece, a plate heat exchanger with a hot side and a cold side, and a cooling tower, a feed pipe is connected between the nitrification tank and the hot side of the plate heat exchanger, and a return pipe is connected between the denitrification tank and the plate heat exchanger. The cooling device for leachate denitrification further comprises a water inlet pipe connected with the return pipe and a flushing assembly, and the defoaming piece comprises a defoaming header pipe, a plurality of defoaming branch pipes and a spray head. By arranging the defoaming piece, multi-point defoaming is achieved, the uniformity of the defoaming effect is ensured, the nozzle is a duckbilled nozzle, so that the impact force of water can be enhanced, the foam structure can be quickly damaged, the defoaming effect is improved, the problem of nozzle blockage is effectively prevented, and the use amount of a defoaming agent is greatly reduced; meanwhile, by arranging the flushing assembly, the hot side of the plate heat exchanger can be flushed, frequent manual cleaning is not needed, and the maintenance cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of denitrification, in particular to a cooling device for denitrification of leachate. Background Art

[0002] As a by-product of the treatment process in landfills, incineration plants, etc., leachate is extremely difficult to treat. It not only contains a large amount of organic matter, inorganic salts and nitrogen compounds, but the total nitrogen content often exceeds the standard due to improper operation and management. In addition, leachate is prone to produce a large amount of foam during the treatment process, which seriously affects the treatment effect. Therefore, defoaming treatment is required. The traditional defoaming system uses pipes to enter the nitrification tank, and the outlet of the defoaming pipe is specially treated. The nitrification tank is only equipped with a few defoaming ports, so the hydraulic impact force is small and unevenly distributed, resulting in poor defoaming effect. At the same time, since plate heat exchangers are used in the leachate treatment process, and the water inlet on the hot side of the heat exchanger is activated sludge with a concentration of up to 15g / L, this sludge can easily cause the plate heat exchanger to clog, and it is impossible to determine whether the plate heat exchanger is clogged in time, requiring frequent manual cleaning, which increases maintenance costs. Utility Model Content

[0003] Based on this, it is necessary to provide a cooling device for denitrification of leachate with good defoaming effect and low maintenance cost.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a cooling device for denitrification of leachate, the cooling device for denitrification of leachate comprising a nitrification tank, a denitrification tank arranged adjacent to the nitrification tank, a defoaming component arranged on the nitrification tank, a plate heat exchanger having a hot side and a cold side, and a cooling tower connected to the cold side of the plate heat exchanger, a feed pipe is connected between the nitrification tank and the hot side of the plate heat exchanger, a return pipe is connected between the denitrification tank and the plate heat exchanger, the cooling device for denitrification of leachate further comprises a water inlet pipe connected to the return pipe, and a flushing component, the defoaming component comprises a defoaming main pipe connected to the return pipe, a plurality of defoaming branches connected to the defoaming main pipe, and a nozzle arranged on the defoaming branch pipe.

[0005] Furthermore, a water collecting pan is provided in the cooling tower, and the water collecting pan has an inlet and an outlet. A liquid inlet pipe and a liquid return pipe are connected between the cooling tower and the plate heat exchanger. One end of the liquid inlet pipe is connected to the lower end of the cold side of the plate heat exchanger, and the other end of the liquid inlet pipe is connected to the outlet of the water collecting pan. One end of the liquid return pipe is connected to the upper end of the cold side of the plate heat exchanger, and the other end of the liquid return pipe is connected to the inlet of the water collecting pan.

[0006] Furthermore, the flushing assembly includes a first flushing pipe, a second flushing pipe, a third flushing pipe and a fourth flushing pipe. The first flushing pipe is arranged between the liquid inlet pipe and the return pipe, and one end of the first flushing pipe is located between the cooling water pump and the acid addition pipe. The second flushing pipe is arranged between the return pipe and the feed pipe, and the second flushing pipe is also connected to the first flushing pipe. The third flushing pipe is arranged between the feed pipe and the nitrification tank, and the third flushing pipe is also connected to the second flushing pipe. The fourth flushing pipe is arranged between the return pipe and the nitrification tank.

[0007] Furthermore, a first flushing valve is provided on the first flushing pipe, a second flushing valve is provided on the feed pipe, a third flushing valve is provided on the return pipe, a fourth flushing valve is provided on the fourth flushing pipe, and a fifth flushing valve is provided on the third flushing pipe.

[0008] Furthermore, differential pressure transmitters are provided at both ends of the hot side and both ends of the cold side of the plate heat exchanger.

[0009] Furthermore, the liquid inlet pipe is also connected to an acid adding pipe.

[0010] Furthermore, a water outlet pipe is provided on the nitrification tank.

[0011] Furthermore, a feed pump is provided on the feed pipe.

[0012] Furthermore, a reflux pump is provided on the reflux pipe.

[0013] Furthermore, a defoaming valve is provided on the defoaming main pipe.

[0014] The beneficial effects of the utility model are as follows: the cooling device for denitrification of leachate provided by the utility model realizes multi-point defoaming by arranging a defoaming part, ensures the uniformity of the defoaming effect, and the nozzle is a duckbill nozzle, which can enhance the impact force of water, thereby quickly destroying the foam structure, improving the defoaming effect, and effectively preventing the problem of nozzle clogging, and greatly reducing the use of defoaming agents; at the same time, by arranging a flushing component, the hot side of the plate heat exchanger can be flushed, without the need for frequent manual cleaning, and the maintenance cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 It is a structural schematic diagram of a cooling device for denitrification of leachate according to the present invention.

[0017] The names and numbers of the parts in the figure are: 1. Nitrification tank; 11. Outlet pipe; 12. Feed pipe; 121. Feed pump; 122. Second flushing valve; 2. Denitrification tank; 21. Return pipe; 211. Return pump; 212. Third flushing valve; 3. Defoaming component; 31. Defoaming main pipe; 311. Defoaming valve; 32. Defoaming branch pipe; 33. Nozzle; 4. Plate heat exchanger; 41. Hot side; 42. Cold side; 43. Pressure differential transmitter; 5. Cooling tower; 51. Liquid inlet pipe; 510. Pneumatic butterfly valve; 511. Cooling water pump; 512. Acid addition pipe; 52. Liquid return pipe; 6. Water inlet pipe; 7. Flushing assembly; 71. First flushing pipe; 711. First flushing valve; 72. Second flushing pipe; 73. Third flushing pipe; 731. Fifth flushing valve; 74. Fourth flushing pipe; 741. Fourth flushing valve. DETAILED DESCRIPTION

[0018] The present invention will now be described in detail with reference to the accompanying drawings. This drawing is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore only shows the components related to the present invention.

[0019] See also Figure 1 The present invention provides a cooling device for denitrification of leachate, which includes a nitrification tank 1, a denitrification tank 2, a defoaming component 3, a plate heat exchanger 4, and a cooling tower 5. The nitrification tank 1 is arranged adjacent to the denitrification tank 2, the defoaming component 3 is arranged on the nitrification tank 1, and the plate heat exchanger 4 has a hot side 41 and a cold side 42. One end of the hot side 41 is connected to the nitrification tank 1, and the other end of the hot side 41 is connected to the denitrification tank 2. Both ends of the cold side 42 are connected to the cooling tower 5. When in use, the leachate in the nitrification tank 1 enters the hot side 41 of the plate heat exchanger 4, and the cooling water in the cooling tower 5 enters the cold side 42 of the plate heat exchanger 4 to exchange heat with the hot side 41, thereby reducing the heat of the leachate. After heat exchange, the leachate is mixed with the influent and enters the denitrification tank 2.

[0020] The nitrification tank 1 is provided with a water outlet pipe 11 so that the water in the nitrification tank 1 can flow out through the water outlet pipe 11 .

[0021] A feed pipe 12 is connected between the nitrification tank 1 and the plate heat exchanger 4. Specifically, one end of the feed pipe 12 is connected to one end of the hot side 41 of the plate heat exchanger 4, while the other end of the feed pipe 12 extends into the nitrification tank 1 and into the interior of the nitrification tank 1. Furthermore, a feed pump 121 is provided on the feed pipe 12. By activating the feed pump 121, the feed pipe 12 can be switched on and off. During operation, activating the feed pump 121 allows the treated leachate in the nitrification tank 1 to enter the hot side 41 of the plate heat exchanger 4.

[0022] A return pipe 21 is connected between the denitrification tank 2 and the plate heat exchanger 4. Specifically, one end of the return pipe 21 is connected to the other end of the hot side 41 of the plate heat exchanger 4, and the other end of the return pipe 21 is connected to the denitrification tank 2. Furthermore, a return pump 211 is provided on the return pipe 21. By starting the return pump 211, the return pipe 21 can be opened and closed.

[0023] The leachate denitrification cooling device further includes a water inlet pipe 6, which is connected to a return pipe 21. During operation, the cooled leachate flows from the plate heat exchanger 4 into the return pipe 21. Water then flows from the water inlet pipe 6 into the return pipe 21, where it mixes with the leachate in the return pipe 21 and enters the denitrification tank 2. This reduces the impact of dissolved oxygen in the mixed solution on the denitrification tank 2 and enables efficient and accurate nitrate reflow.

[0024] The defoaming component 3 includes a main defoaming pipe 31, branch defoaming pipes 32, and nozzles 33. The main defoaming pipe 31 is connected to the return pipe 21 and is located between the return pump 211 and the plate heat exchanger 4. There are multiple branch defoaming pipes 32, each connected to the main defoaming pipe 31, forming a "F"-shaped pipeline structure. There are multiple nozzles 33, each disposed on the branch defoaming pipes 32 and communicating with the branch defoaming pipes 32, thereby achieving multi-point defoaming and ensuring uniform defoaming effect. In this embodiment, the nozzles 33 are duckbill nozzles, which can enhance the impact force of water, thereby quickly destroying the foam structure, improving the defoaming effect, effectively preventing nozzle clogging, and significantly reducing the amount of defoaming agent used. In addition, the mud-water mixture after heat exchange in the plate heat exchanger 4 passes through the reflux pipe 21 and the defoaming element 3 and enters the nitrification tank 1 for hydraulic defoaming, which not only achieves the dual effects of cooling and defoaming, but also eliminates the need for an additional defoaming pump.

[0025] Furthermore, a defoaming valve 311 is provided on the defoaming main pipe 31. When the defoaming element 3 needs to be flushed, the cooling water pump 511, the first flushing valve 711, and the defoaming valve 311 are opened, so that water in the water collecting pan can enter the liquid inlet pipe 51, the first flushing pipe 71, and the defoaming main pipe 31, and then flush the defoaming element through the defoaming branch pipe 32 and the nozzle 33.

[0026] The cooling tower 5 is equipped with a water collection tray (not shown) with an inlet and an outlet. A liquid inlet pipe 51 and a liquid return pipe 52 are connected between the cooling tower 5 and the plate heat exchanger 4. Specifically, one end of the liquid inlet pipe 51 is connected to the lower end of the cold side 42 of the plate heat exchanger 4, and the other end is connected to the outlet of the water collection tray. One end of the liquid return pipe 52 is connected to the upper end of the cold side 42 of the plate heat exchanger 4, and the other end is connected to the inlet of the water collection tray. Furthermore, a cooling water pump 511 is provided on the liquid inlet pipe 51. The cooling water pump 511 is configured to control the on / off operation of the liquid inlet pipe 51. When in use, the cooling water pump 511 is turned on, drawing water from the water collection tray into the liquid inlet pipe 51. The cooling water is then transported to the plate heat exchanger 4 for heat exchange, and then returned to the water collection tray via the liquid return pipe 52 for cooling.

[0027] Furthermore, the liquid inlet pipe 51 is connected to an acid addition pipe 512, which is connected between the cooling water pump 511 and the plate heat exchanger 4. The acid addition pipe 512 is provided with a pneumatic butterfly valve 510, which can control the on and off of the acid addition pipe 512. When the cooling water needs to be cleaned, since the cooling water is constantly circulating in the cold side 42 of the plate heat exchanger 4, it is easy to cause salt accumulation. The pneumatic butterfly valve 510 is opened, and acid is added to the acid addition pipe 512 for deep cleaning, so as to completely remove the dirt on the cold side 42 and ensure heat exchange efficiency.

[0028] In order to prevent the plate heat exchanger 4 from being blocked, the cooling device for denitrification of the leachate also includes a flushing assembly 7, which includes a first flushing pipe 71, a second flushing pipe 72, a third flushing pipe 73 and a fourth flushing pipe 74. The first flushing pipe 71 is arranged between the liquid inlet pipe 51 and the reflux pipe 21, and one end of the first flushing pipe 71 is located between the cooling water pump 511 and the acid addition pipe 512. The second flushing pipe 72 is arranged between the reflux pipe 21 and the feed pipe 12, and the second flushing pipe 72 is also connected to the first flushing pipe 71. The third flushing pipe 73 is arranged between the feed pipe 12 and the nitrification tank 1, and the third flushing pipe 73 is also connected to the second flushing pipe 72. The fourth flushing pipe 74 is arranged between the reflux pipe 21 and the nitrification tank 1.

[0029] Furthermore, a first flush valve 711 is provided on the first flush pipe 71, a second flush valve 122 is provided on the feed pipe 12, a third flush valve 212 is provided on the return pipe 21, a fourth flush valve 741 is provided on the fourth flush pipe 74, and a fifth flush valve 731 is provided on the third flush pipe 73. In this embodiment, the first flush valve 711, the second flush valve 122, the third flush valve 212, the fourth flush valve 741, and the fifth flush valve 731 are all pneumatic butterfly valves. When it is necessary to forward flush the hot side of the plate heat exchanger 4, first open the cooling water pump 511, the first flushing valve 711, the second flushing valve 122 and the third flushing valve 212 in sequence, so that the water in the water collecting tray can enter the liquid inlet pipe 51, the first flushing pipe 71 and the feed pipe 12, and then enter the plate heat exchanger 4 from the bottom end of the hot side 41 of the plate heat exchanger 4 for flushing, and then come out from the top end of the hot side 41 of the plate heat exchanger 4, enter the reflux pipe 21 and the fourth flushing pipe 74, and then flow into the nitrification tank 1. When the hot side of the plate heat exchanger 4 needs to be reversely flushed, the cooling water pump 511, the first flushing valve 711, the third flushing valve 212, the second flushing valve 122 and the fifth flushing valve 731 are first opened in sequence, so that the water in the water collecting tray can enter the liquid inlet pipe 51, the first flushing pipe 71 and the return pipe 21, and then enter the plate heat exchanger 4 from the top end of the hot side 41 of the plate heat exchanger 4 for flushing, and then come out from the bottom end of the hot side 41 of the plate heat exchanger 4, enter the feed pipe 12 and the fifth flushing pipe 75, and then flow into the nitrification tank 1.

[0030] Furthermore, pressure differential transmitters 43 are provided at both ends of the hot side 41 and both ends of the cold side 42 of the plate heat exchanger 4, so that the pressure differential inside the plate heat exchanger 4 can be monitored online, and the blockage status can be judged by the pressure differential, so that the staff can take unblocking measures in time, without the need for frequent manual cleaning, and the maintenance cost is low.

[0031] Furthermore, the cooling device for denitrification of the leachate is also provided with a controller (not shown in the figure), which is electrically connected to the pressure differential transmitter 43, the first flushing valve 711, the second flushing valve 122, the third flushing valve 212 and the fourth flushing valve 741. When the pressure differential transmitter 43 detects that the pressure difference in the plate heat exchanger 4 is large, the controller controls the first flushing valve 711, the second flushing valve 122, the third flushing valve 212 and the fourth flushing valve 741 to open in sequence to flush the hot side 41 of the plate heat exchanger 4.

[0032] During use, the leachate in the nitrification tank 1 enters the hot side 41 of the plate heat exchanger 4 through the feed pipe 12, and the cooling water in the cooling tower 5 enters the cold side 42 of the plate heat exchanger 4 through the liquid inlet pipe 51 and exchanges heat with the hot side 41, thereby reducing the heat of the leachate. Part of the leachate after heat exchange enters the defoaming element 3 through the return pipe 21 to defoam the leachate in the nitrification tank 1, another part is mixed with the water in the water inlet pipe 6 through the return pipe 21 and enters the denitrification tank 2, and another part returns to the nitrification tank 1 through the return pipe 21 and the fourth flushing pipe 74 to cool the nitrification tank 1.

[0033] The cooling device for denitrification of leachate provided by the utility model realizes multi-point defoaming by providing a defoaming member 3, thereby ensuring the uniformity of the defoaming effect, and the nozzle 33 is a duckbill nozzle, which can enhance the impact force of water, thereby quickly destroying the foam structure, improving the defoaming effect, and effectively preventing the problem of nozzle clogging, and greatly reducing the use of defoaming agents; at the same time, by providing a flushing component 7, the hot side 41 of the plate heat exchanger 4 can be flushed, without the need for frequent manual cleaning, and the maintenance cost is low.

[0034] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the scope of the present invention. The technical scope of this utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A cooling device for denitrification of leachate, characterized by: The cooling device for denitrification of leachate includes a nitrification tank, a denitrification tank arranged adjacent to the nitrification tank, a defoaming component arranged on the nitrification tank, a plate heat exchanger having a hot side and a cold side, and a cooling tower connected to the cold side of the plate heat exchanger. A feed pipe is connected between the nitrification tank and the hot side of the plate heat exchanger, and a return pipe is connected between the denitrification tank and the plate heat exchanger. The cooling device for denitrification of leachate also includes a water inlet pipe connected to the return pipe and a flushing component. The defoaming component includes a defoaming main pipe connected to the return pipe, multiple defoaming branches connected to the defoaming main pipe, and nozzles arranged on the defoaming branches.

2. The cooling device for denitrification of leachate according to claim 1, characterized in that: A water collecting pan is provided in the cooling tower, and the water collecting pan has an inlet and an outlet. A liquid inlet pipe and a liquid return pipe are connected between the cooling tower and the plate heat exchanger. One end of the liquid inlet pipe is connected to the lower end of the cold side of the plate heat exchanger, and the other end of the liquid inlet pipe is connected to the outlet of the water collecting pan. One end of the liquid return pipe is connected to the upper end of the cold side of the plate heat exchanger, and the other end of the liquid return pipe is connected to the inlet of the water collecting pan.

3. The cooling device for denitrification of leachate according to claim 2, characterized in that: The flushing assembly includes a first flushing pipe, a second flushing pipe, a third flushing pipe and a fourth flushing pipe. The first flushing pipe is arranged between the liquid inlet pipe and the return pipe, and one end of the first flushing pipe is located between the cooling water pump and the acid addition pipe. The second flushing pipe is arranged between the return pipe and the feed pipe, and the second flushing pipe is also connected to the first flushing pipe. The third flushing pipe is arranged between the feed pipe and the nitrification tank, and the third flushing pipe is also connected to the second flushing pipe. The fourth flushing pipe is arranged between the return pipe and the nitrification tank.

4. The cooling device for denitrification of leachate according to claim 3, characterized in that: The first flushing pipe is provided with a first flushing valve, the feed pipe is also provided with a second flushing valve, the return pipe is also provided with a third flushing valve, the fourth flushing pipe is provided with a fourth flushing valve, and the third flushing pipe is provided with a fifth flushing valve.

5. The cooling device for denitrification of leachate according to claim 1, characterized in that: Differential pressure transmitters are provided at both ends of the hot side and both ends of the cold side of the plate heat exchanger.

6. The cooling device for denitrification of leachate according to claim 2, characterized in that: The liquid inlet pipe is also connected with an acid adding pipe.

7. The cooling device for denitrification of leachate according to claim 1, characterized in that: The nitrification tank is provided with a water outlet pipe.

8. The cooling device for denitrification of leachate according to claim 1, characterized in that: A feed pump is provided on the feed pipe.

9. The cooling device for denitrification of leachate according to claim 1, characterized in that: A reflux pump is provided on the reflux pipe.

10. The cooling device for denitrification of leachate according to claim 1, characterized in that: The defoaming main pipe is provided with a defoaming valve.

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